Vulnerability Details CVE-2025-64340
FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has been patched in version 3.2.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 6.6%
CVSS Severity
CVSS v3 Score 6.7
References
Products affected by CVE-2025-64340
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cpe:2.3:a:jlowin:fastmcp:0.1.0
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cpe:2.3:a:jlowin:fastmcp:0.2.0
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cpe:2.3:a:jlowin:fastmcp:0.3.0
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cpe:2.3:a:jlowin:fastmcp:0.3.1
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cpe:2.3:a:jlowin:fastmcp:0.3.2
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cpe:2.3:a:jlowin:fastmcp:0.3.3
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cpe:2.3:a:jlowin:fastmcp:0.3.4
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cpe:2.3:a:jlowin:fastmcp:0.3.5
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cpe:2.3:a:jlowin:fastmcp:0.4.0
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cpe:2.3:a:jlowin:fastmcp:0.4.1
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cpe:2.3:a:jlowin:fastmcp:1.0
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cpe:2.3:a:jlowin:fastmcp:2.0.0
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cpe:2.3:a:jlowin:fastmcp:2.1.0
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cpe:2.3:a:jlowin:fastmcp:2.1.1
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cpe:2.3:a:jlowin:fastmcp:2.1.2
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cpe:2.3:a:jlowin:fastmcp:2.10.0
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cpe:2.3:a:jlowin:fastmcp:2.10.1
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cpe:2.3:a:jlowin:fastmcp:2.10.2
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cpe:2.3:a:jlowin:fastmcp:2.10.3
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cpe:2.3:a:jlowin:fastmcp:2.10.4
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cpe:2.3:a:jlowin:fastmcp:2.10.5
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cpe:2.3:a:jlowin:fastmcp:2.10.6
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cpe:2.3:a:jlowin:fastmcp:2.11.0
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cpe:2.3:a:jlowin:fastmcp:2.11.1
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cpe:2.3:a:jlowin:fastmcp:2.11.2
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cpe:2.3:a:jlowin:fastmcp:2.11.3
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cpe:2.3:a:jlowin:fastmcp:2.12.0
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cpe:2.3:a:jlowin:fastmcp:2.12.1
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cpe:2.3:a:jlowin:fastmcp:2.12.2
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cpe:2.3:a:jlowin:fastmcp:2.12.3
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cpe:2.3:a:jlowin:fastmcp:2.12.4
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cpe:2.3:a:jlowin:fastmcp:2.12.5
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cpe:2.3:a:jlowin:fastmcp:2.13.0
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cpe:2.3:a:jlowin:fastmcp:2.13.0.1
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cpe:2.3:a:jlowin:fastmcp:2.13.0.2
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cpe:2.3:a:jlowin:fastmcp:2.13.1
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cpe:2.3:a:jlowin:fastmcp:2.13.2
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cpe:2.3:a:jlowin:fastmcp:2.13.3
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cpe:2.3:a:jlowin:fastmcp:2.14.0
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cpe:2.3:a:jlowin:fastmcp:2.14.1
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cpe:2.3:a:jlowin:fastmcp:2.14.2
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cpe:2.3:a:jlowin:fastmcp:2.14.3
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cpe:2.3:a:jlowin:fastmcp:2.14.4
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cpe:2.3:a:jlowin:fastmcp:2.14.5
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cpe:2.3:a:jlowin:fastmcp:2.2.0
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cpe:2.3:a:jlowin:fastmcp:2.2.1
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cpe:2.3:a:jlowin:fastmcp:2.2.10
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cpe:2.3:a:jlowin:fastmcp:2.2.2
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cpe:2.3:a:jlowin:fastmcp:2.2.3
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cpe:2.3:a:jlowin:fastmcp:2.2.4
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cpe:2.3:a:jlowin:fastmcp:2.2.5
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cpe:2.3:a:jlowin:fastmcp:2.2.6
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cpe:2.3:a:jlowin:fastmcp:2.2.7
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cpe:2.3:a:jlowin:fastmcp:2.2.8
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cpe:2.3:a:jlowin:fastmcp:2.2.9
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cpe:2.3:a:jlowin:fastmcp:2.3.0
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cpe:2.3:a:jlowin:fastmcp:2.3.1
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cpe:2.3:a:jlowin:fastmcp:2.3.2
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cpe:2.3:a:jlowin:fastmcp:2.3.3
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cpe:2.3:a:jlowin:fastmcp:2.3.4
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cpe:2.3:a:jlowin:fastmcp:2.3.5
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cpe:2.3:a:jlowin:fastmcp:2.4.0
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cpe:2.3:a:jlowin:fastmcp:2.5.0
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cpe:2.3:a:jlowin:fastmcp:2.5.1
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cpe:2.3:a:jlowin:fastmcp:2.5.2
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cpe:2.3:a:jlowin:fastmcp:2.6.0
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cpe:2.3:a:jlowin:fastmcp:2.6.1
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cpe:2.3:a:jlowin:fastmcp:2.7.0
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cpe:2.3:a:jlowin:fastmcp:2.7.1
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cpe:2.3:a:jlowin:fastmcp:2.8.0
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cpe:2.3:a:jlowin:fastmcp:2.8.1
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cpe:2.3:a:jlowin:fastmcp:2.9.0
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cpe:2.3:a:jlowin:fastmcp:2.9.1
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cpe:2.3:a:jlowin:fastmcp:2.9.2
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cpe:2.3:a:jlowin:fastmcp:3.0.0
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cpe:2.3:a:jlowin:fastmcp:3.0.1
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cpe:2.3:a:jlowin:fastmcp:3.0.2
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cpe:2.3:a:jlowin:fastmcp:3.1.0
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cpe:2.3:a:jlowin:fastmcp:3.1.1